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Fig. 3A —41-year-old woman with suspected complicated renal colic (intense left flank pain and fever). Axial low-dose CT image (120 kV, 30 mAs, pitch of 1.25, 5-mm collimation) (A) shows wall irregularities of horizontal sigmoid colon (arrowheads) and infiltration of perisigmoid fatty tissue (asterisk), suggesting diverticulitis. Axial standard-dose CT image (120 kV, 180 mAs, pitch of 1, 5-mm collimation) (B) shows same findings as low-dose CT.